Since the C7 comes with 4 free oil changes dealers having been screwing over C7 owners on oil changes and not only not using Mobil I even when owners ask but then have been charging owners if dealer then does use Mobil I

GM is making it clear what a dealer must do :

To: Chevrolet, Buick, and GMC Dealers

The 2014-2015 Chevrolet Complete Care Program for Corvettes was designed to take into account the preferred Mobil 1 oil choice of many Corvette owners.

As a reminder, dealers are required to use Mobil 1 when performing oil changes on ALL 2014-2015 Corvettes through the Chevrolet Complete Care Program.
Current reimbursement levels for Corvette are based on Mobil 1 usage.

Please remind all personnel that only Mobil 1 should be used.

In addition, please refer to GlobalConnect message # G_0000205212 for details on dry sump equipped (Z51, Z52, and Z06) Corvettes.

In the event a customer paid an upcharge for Mobil 1 under the Chevrolet Complete Care Program, customers should be directed to contact Executive CAC at (855) 435-7284 or email helpacustomer@gm.com for reimbursement.